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Simplifying 21 = 3(2 + 3x) + -4 21 = (2 * 3 + 3x * 3) + -4 21 = (6 + 9x) + -4 Reorder the terms: 21 = 6 + -4 + 9x Combine like terms: 6 + -4 = 2 21 = 2 + 9x Solving 21 = 2 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 21 + -9x = 2 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + -9x = 2 + 0 21 + -9x = 2 Add '-21' to each side of the equation. 21 + -21 + -9x = 2 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 2 + -21 -9x = 2 + -21 Combine like terms: 2 + -21 = -19 -9x = -19 Divide each side by '-9'. x = 2.111111111 Simplifying x = 2.111111111
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